| Fabricated steel structure has excellent performance and green virtue.Apply it to Chinese rural housing can improve the seismic performance of traditional rural residence and save resources and energy,the application and development of fabricated steel structure in rural areas can be promote,also.At present,there are few materials of green wall which are suitable for fabricated steel structure and have the disadvantages of high cost and easy cracking.In order to reduce the cost of fabricated steel structure and the building envelope,improve the construction quality of rural residential buildings and promote the popularization of the structure and green wall materials in rural areas,this paper presents a new wall material named fiber gypsum-based composite wall material,which is mainly made of industrial waste residues and plant fibre,has low cost and excellent crack resistance,and the optimum mix proportion of fiber gypsum-based composite wall material was determined through experiment.On this basis,we manufactured the fiber gypsum-based composite wallboard and designed three one-story and one-bay specimens with scale of 1:4 which includes two connection types between the wall and frame.Among them,the composite wallboard was fixed by L-type Angle steel in the rigid connection and connected by z-type connector in the flexible connection.The seismic performance of structure of fiber gypsum-based composite wallboard with lightweight steel frame was investigated by experiment.The research works are summarized as follows:(1)The experiment of proportion of fiber gypsum-based composite wall material was carried out to study the influence of the compound activators,plant fiber,water-binder ratio and water-reducing agent on composite wall material,and finally the optimal proportion of fiber gypsum-based composite wall material was determined.The results indicate that the optimum mass fractions of NaOH,quicklime and cement are 0.5%,8% and 10%,respectively.It also indicates that the mechanical properties of the wall material are the best when the dosage of Ramie fiber and FDN water-reducing agent are 2% and 1%.The optimum water-binder ratio is 0.38.These components are mixed by the mass ratio on the basis of the overall mass of gypsum,flyash and slag.(2)1 specimen of pure lightweight steel frame,1 specimen of lightweight steel frame has the rigid connection with the composite wallboard and 1 specimen of lightweight steel frame has the flexible connection with the composite wallboard were tested under low cyclic loading,the hysteretic behavior and failure patterns of the specimens were investigated,and the skeleton curve,strength degradation curve,stiffness degradation curve and energy dissipation capacity of the specimens were obtained by calculating the hysteretic data.The results show that the fiber gypsum-based composite wallboard can improve the lateral stiffness and energy dissipation capacity of lightweight steel frame under horizontal loads,and both have excellent coordinated working performance.No matter flexible or rigid connection between the frame and composite wallboard,the wallboard has not suffered great damage and good damaged resistance capacity.In the flexible connection,the composite wallboard can adapt to the deformation of the steel fra me and generate good following characteristic by the z-type connector,which can reduce the damage of the wallboard and play the role of friction energy dissipation.The structure of light steel frame with fiber gypsum-based composite wallboard exhibits favorable seismic performance and security which can be used in low-rise rural dwelling.The research results of this paper will provide some theoretical basis for the production and construction of fiber gypsum-based composite wallboard and the application of the structure of fiber gypsum-based composite wallboard with lightweight steel frame. |
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